Oh the topic of the WW2 and WW1.
If it wasn't for RUSSIAN actions just before WW1 (Russian back separatists killed Austrian Arch-Duke) WW1 would not have "really" gone off. Then, in '39 Russia was AGAIN an aggressor in starting the war.
Fun Fact: Most American Generals wanted to attack the Russians because of their early involvement in the war and the subsequent expected results of what would happen after, but the US was happy to end the war with some Nuclear Bombs and say: "Enough!"